International Classification of Childhood Cancer

"The classification of childhood cancer is based on tumor morphology and primary site with an emphasis on morphology rather than the emphasis on primary site for adults.

In the ICCC, there are certain combinations of histologies, behaviors, and/or sites that are not considered in the schema, and for these we have added a group for unknown ICCC, which includes in situ tumors and some malignant tumors. Therefore, when we produce all sites based on ICCC, we will exclude these cases."